58 lignes
1.5 KiB
Lua
58 lignes
1.5 KiB
Lua
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local GetTime = QuestHelper_GetTime
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QuestHelper_File["collect_bitstream.lua"] = "4.0.1.$svnversion$"
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QuestHelper_Loadtime["collect_bitstream.lua"] = GetTime()
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local Merger
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local function Output(outbits)
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return {
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r = {},
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cbits = 0,
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cval = 0,
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append = function (self, value, bits)
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self.cbits = self.cbits + bits
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self.cval = bit.lshift(self.cval, bits)
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self.cval = self.cval + value
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while self.cbits >= outbits do
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Merger.Add(self.r, strchar(bit.rshift(self.cval, self.cbits - outbits)))
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self.cbits = self.cbits - outbits
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self.cval = bit.band(self.cval, bit.lshift(1, self.cbits) - 1)
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end
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end,
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finish = function (self)
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if self.cbits > 0 then self:append(0, outbits - self.cbits) end
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return Merger.Finish(self.r)
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end,
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}
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end
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local function Input(indata, outbits)
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return {
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cbits = 0,
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cval = 0,
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coffset = 1,
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depend = function (self, bits)
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while self.cbits < bits do
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self.cbits = self.cbits + outbits
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self.cval = bit.lshift(self.cval, outbits) + strbyte(indata, self.coffset)
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self.coffset = self.coffset + 1
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end
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local rv = bit.rshift(self.cval, self.cbits - bits)
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self.cbits = self.cbits - bits;
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self.cval = bit.band(self.cval, bit.lshift(1, self.cbits) - 1)
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return rv
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end,
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}
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end
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function QH_Collect_Bitstream_Init(_, API)
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Merger = API.Utility_Merger
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QuestHelper: Assert(Merger)
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API.Utility_Bitstream = {Input = Input, Output = Output}
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end
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